package com.itheima.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.ShoppingCart;
import com.itheima.reggie.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

@RestController
@Slf4j
@RequestMapping("/shoppingCart")
public class ShoppingCartController {
    @Autowired
    private ShoppingCartService shoppingCartService;

    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart){
        log.info("购物车数据{}",shoppingCart);
        //设置用户id，指定是哪个用户的购物车
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);
        //咨询当前菜品或套餐是否在购物车中
        Long dishId = shoppingCart.getDishId();

        LambdaQueryWrapper<ShoppingCart> queryWrapper=new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);
        if(dishId!=null){
            //添加到购物车的是菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        }
        else{
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);
        if(cartServiceOne!=null){
            //如果存在数量加1
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setCreateTime(LocalDateTime.now());
            cartServiceOne.setNumber(number+1);
            shoppingCartService.updateById(cartServiceOne);
        }else {
            //如果不存在则添加到购物车，数量为1
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            cartServiceOne=shoppingCart;
        }
        return R.success(cartServiceOne);
    }
    @PostMapping("/sub")
    public R<ShoppingCart> sub(@RequestBody ShoppingCart shoppingCart){
        log.info("购物车数据{}",shoppingCart);
        //设置用户id，指定是哪个用户的购物车
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);
        //咨询当前菜品或套餐是否在购物车中
        Long dishId = shoppingCart.getDishId();

        LambdaQueryWrapper<ShoppingCart> queryWrapper=new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);
        if(dishId!=null){
            //添加到购物车的是菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        }
        else{
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);
        Integer number=cartServiceOne.getNumber();
        if(cartServiceOne.getNumber()>1){
            //如果存在数量加1
            cartServiceOne.setNumber(number-1);
            shoppingCartService.updateById(cartServiceOne);
        }else {
            cartServiceOne.setNumber(0);
           shoppingCartService.remove(queryWrapper);
        }
        return R.success(cartServiceOne);
    }
    @GetMapping("/list")
    public R<List<ShoppingCart>> list(){
        log.info("查看购物车...");

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        queryWrapper.orderByAsc(ShoppingCart::getCreateTime);

        List<ShoppingCart> list = shoppingCartService.list(queryWrapper);

        return R.success(list);
    }

    /**
     * 清空购物车
     * @return
     */
    @DeleteMapping("/clean")
    public R<String> clean(){
        //SQL:delete from shopping_cart where user_id = ?

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());

        shoppingCartService.remove(queryWrapper);

        return R.success("清空购物车成功");
    }
}
